Variable-exhaust pipe



J. PATRICK. VARIABLE EXHAUST PIPE.

No. 22,820'. Patented Feb. l, .1859.

MMM'

UNITED STATES PATENT OFFICE.

JONES PATRICK, OF CHICAGO, ILLINOIS.

VARIABLE-EXHAUST PIPE.

Specification of Letters Patent No. 22,820, dated February 1, 1859.

T 0 all whom ttmwy concern:

Beit known that Il, JONES PATRICK, of the city of Chicago, in the countyof Cook and State of Illinois, have invented a new and useful Machinefor Regulating and Varying the Exhaust in High-Pressure Steam- Engines;and I do hereby declare that the following is a full, clear, and exactdescription of the construction and operation of the same, referencebeing had to the accompanying drawings, making a part of thisspecification, andf to the letters of reference marked thereon, of whichdrawings-Plan No. l

shows a front elevation as fixed for use in the smoke chamber of anordinary locomotive engine. Plan Nos. 2 and 3 show a top View of thesame as fixed in said smoke chamber. tion, with a similar section of aportion of the exhaust pipes of an engine to which the same is affixed.

The nature of my invention, consists in the manner in which I combine,the rotating cylinder of adjustable exhaust openings, with a mechanismin convenient position to the engineer or fireman, for the purpose ofinsuring the turning of said cylinder or plate, and thus increase ordiminish the area of exhaust opening at pleasure.

To enable others to make and use my invention, I will describe itsconstruction, and operation.

In any high pressure steam engine, when it is desired to increase theforce of the fireblast by allowing the exhaust steam to escape into thesmoke chamber, or smoke stack, where the end or ends, of the exhaustpipe or pipes open into the smoke chamber or stack, or when the exhauststeam is in any way caused to escape, through t-he smoke chamber orsmoke stack for the purpose of increasing the fire-blast, I aflix to thesaid end or ends (as the case may be) an immovable plate of brass, iron,or any other proper material, so perforated that the end or ends of suchpipe or pipes shall pass through it and form a perfectly plane surfacetherewith; this plate I shall designate as plate B. (See plan of plate Bin drawing.) It is to be of sufficient thickness and body, to give it afirm hold of the pipe or pipes, so as to serve as a support for plate Ahereafter to be described. In order to secure freedom from clogging bydust, cinders, &c., plate B may be perforated by as many holes of thesame or varying sizes as Plan No. 4:; shows a vertical secshall bedeemedl desirable in any particular case. Resting upon the plate B, asecond plate A is to be placed (see plan of plate A in drawing)` B beingdesigned merely as a supportfor A. The two plates may b-e connected bymeans of a bolt` G passing through their centers, and so contrived as toadmit of the easy revolution of A, thereon on its axis. The surfaces ofA `and B thus brought in contact are to be ground and polished so as tomake as nearly as possible, a steam-tight joint. I perforat-e plate Awith two or more holes, of varying sizes for each exhaust pipe, the saidholes being` so arranged, as that by the revolution of A upon its axis,said holes may be consecutively brought over thel orifice or orifices ofthe exhaust pipe or pipes atthe will of the personV having charge of theworking of the engine. These holes, or pairs of holes, in plate A mayvary from the full size of the orifice of the exhaust pipe, to suchsmaller sizes as shall be deemed needful for the purpose of varying theexhaust; and the number of holes, or pairs of holes, and consequentnumber of variations in the exhaust, the mechanic may determine forhimself accord-ing' to the circumstances of any given case. I wouldrecommend however, that not less than three sizes of holes be used.

Plate A may beof any convenient thickness; but if less than six inches,I would recommend that pipes or petticoats be inserted in each hole,closely tt-ing thereto, of suiiicient length tomake up at least thatamount of tubing for the passage of the exhaust steam. I would alsorecommend that the holes in plate A, on the side coming in contact withplate B be equal in size with the orifices of the exhaust pipes; andthat the variations i'n the sizes of the holes in plate A, be made bytapering the same, or the tubing before mentioned, to the upper openingof said holes in plate A, as byso doing amore perfect exhaust will beobtained, and there will be less liability to leakage.

Plan No. 4.- is a vertical section of one of my machines, calculated foran engine with two exhaust pipes, and showing a vertical section of aportion of the exhaust-pipes. A is the revolving plate; Gr the bolt bywhich A is connected with B, and upon which A turns, as its axis. B isthe plate fastened to the exhaust pipes, and which serves as a supportto A. C, C, are the exhaust pipes. The holes through plate A are shownby the letters D, E, and F in Plans Nos. 2 and 3, and also in the topview of A in Plan No. 5. Plans Nos. 7 and 8 and 9, show verticalsections of A, cut -through the various sized holes D, E, and F; whileplan No. 6 shows a bottom view of plate A, and it is intended by plansNos. 5, 6, 7, 8 and 9 to illustrate what I have said above as to theconical or tapering shape of the holes through plate A. All this beingdone it will readily be seen that by revolving plate A, in such manneras to bring a different sized hole over the orifice or orifices of theexhaust pipe or pipes, the engineer can, at will, change the force ofthe exhaust into the smoke chamber or stack, and thus regulate and varythe power of the fire blast. Control of the plate A, may be given to theengine-man by means of a lever and ratchet, a screw and worm, a rack andpinionmor any other mechanical application which can be used for thatpurpose. To t-urn this plate or cylinder in which the various sizedopenings D, E, F, are, from the outside and with certainty, I arrange asfollows: On the shaft a, there is fastened an arm b, to which one end ofa connecting rod c is pivoted, the other end of said rod (as moredistinctly seen in Figs. 10 and ll) being pivoted to the head of adouble pawl or claw Z- which in turn is pivoted to the end of a radiusbar f, hung at the center of the turning plate or cylinder of openingsD, E, F. e', z', &c., are grooves cut in the perimeter of the plate A,and open so that no dust or ashes can lie in them; these grooves serveas a ratchet for the arm e of the pawl CZ, to work in.

The operation of this mechanism is as follows: By turning the shaft a,in the proper direction, the pawl is tipped over on its hinged joint, asseen in Fig. 10, so that its arm e is raised up clear of the grooves z',

while its other arm e', runs on the flange under the grooves, and thusprevents it from tipping too far, Near the end of the stroke of theconnecting bar c, said bar comes in contact With the arm (or pawlproper) e, and throws it down upon the plate A, as seen in Fig. l1, sothat it willv take the first notch or groove z', on its return motion,and holding therein draw the plate around a sixth of a revolution whensix holes are used as I represent them-more or less, if more or lessthan six holes are used. Thus the plate or cylinder of holes can beturned at pleasure and with certainty, when it is desired to change thearea of exhaust opening.

It is necessary, as before stated, that t-he cylinder or plate A, shouldmove easy on the plate B-Fig. No. Ll, but still make a close jointwvithit. For this purpose the two are held together by a screw g, upon theneck of which the cylinder or plate A turns. This same screw also holdsthe radius bar and to prevent said'radius bar from bending by thetightening of the screw, a sleeve or thimble is put inside of theopening of the radius bar, which projects slightly, so that thetightening comes upon the ends of said sleeve or thimble and leaves theradius bar free to turn by the action of the pawl..

Having thus fully explained the nature and object of my invention, whatI claim therein as new and desire to secure by Letters Patent is- Incombination with a revolving cylinder or plate of variable size exhaustopenings, the rock shaft pawl, radius bar, and their several.connections, substantially in the manner, and for the purposes setforth.

JONES PATRICK.

IVitnesses T. E. CHANDLER, IVM. GAY SWAN.

